Push chucking mechanism



Aug. 2l, w23.

A. E. DRISSNER PUSH CHUCKING MECHANISM Filed May 1'7. 1921 2 Sheets-Sheet l mw W IITI l III Il: .12- L ,Q y \\W /////4 m WM/ www .w 1 w R/// MW. Y om w mw me@ I @Mya/nto@ q/E'. Dra Ssn er A. E. DRISSNER PUSH CHUCKING MECHANISM Filed May 17. 1921 2 Sheets-Sheet 2 5mm/toa EBI-1s sn eff:

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position, are mounted so as to be axially shiftable one relatively tothe other and at the same time so as to have their juxtaposed faces at all times in fixed and positive re-V lation to each other, the" one revolving with Y theother as a unit. As a result therefore,

the thrust end 'of each finger when actuated engages Vthe thrust receiving member uniformly at a predetermined point. It will be readily Vseen therefore, that if desired, these'predetermined thrust receiving points,

alone may be hardened, as for instance,- the thrust member may be provided with indi- 1 vidual'hardened thrust receiving parts;l

With reference to the drawings illustrat ing a preferred embodiment of my invention,"the same' comprises 'a spindle, 1, mounted in a suitable bushing 2. Over the rear end ofv the 'spindle 1 is mounted a sliding wedge Aor cone-shaped sleeve 3 suitably maehinedso as to slidefreely over the spin- A pushtube 4 is. inserted within the Vspindle 1, the forward end 5 thereof contacting with the rear end of the chuck 6 and the opposite end 7 of the push tube protrud- V ing a suitable distance beyond the rearend ofthe spindle. V-

On the rearend of the spindle a finger or leverV holder 8 is mounted for adjustment as by means of threads 9, the finger holder` be-` ingfnormally held from movement Yon the spindle by means ofa hollow setscrew 9". A pair of slots` 10 are machined to the desired width and depth in the outside face of the finger holder 8, the slots beingpreferr-ablyI located diametricallyopposite each other on a vertical plane through the center line of the finger holder, as illustrated inl Fig. 3, and are provided for the purpose of receiving four holes 11` of anydesired diameter are drilled,;eaeh hole being preferably positionedsubstantially thirtydegrees from the horizontal plane passing thro-ugh the center Y line oft' the spindle. Conce-ntric holes 12 of Y smaller diameter are continued through the frontface ofthe finger holder. Springs 13 are'placed or inserted inthe holes 11 and are held Yin position therein by Y means -of plungers 14; provided with elongated stems 15 projecting through the center of' the springs and through the holes l2 in. the finholder.`

and housing the operating fingers orleve'rsV as hereinafter'deseribed. Y n Into the rear face ofthe fingerholder ger holder. The springs 13 are held between the front inner walls of the holes 171 and the fianges or shoulders 16 of the plungers. Cotter pins 17 may be yplaced in suitable holes in the ends of the stems 15, av precautionary measure, sof as" to preventwithdrawal of the .plungers from the fingerV :A thrust ring, 18isYV mounted adjacent to Y the rear end of the finger holder 8- and fourY holes are drilled therethrough for the purpose of receiving .the short stems 19 Vof the plungersfld, therear shoulders or flanges of the plungers being adapted'to engage the inner face of the thrust ring 18. i Itwill be seen therefore, from this construct-ion that by Vvirtue of the plungers llaresiliently in.-

terconneeting-the finger, holder and thrust 'ring by means of springs 13, the juxtaposed faces of these parts Aare-maintained in constant and fixed relationtoV eachother, the

resilient connection Vpermitting aXialinovement of one relative-lyto the other. Y

Through thelcenterfof the thrustring 18 Y is drilledv a hole 20 of suitable diameter 90 which is counterb'ored to form a shoulder21 as illustrated in Figs. 4 and 5 particularly.;

A thrust Vcollar 22 is then inserted or ,placed Y into position so that a flange machined in itV rests against or engages the shoulder'21 of theeounter-bore. Q v Y Y i, i

The operating fingers orQlevers 23 are, mounted in slots 10 in the fingervholder 8V as hereinbefore set forth, These fingers are pivotally held inthe finger holder 8 prefer 'm0 ably by means of pivot screws 24@ The hook or thrust end 25ct each finger 23 is adapted to engage or Contact with' `shoulder 26 formed in the vthrust collar 22.` This thrust collar may be provided `lat predetermined points with hardened parts fortheepurpose Y of receiving the thrust of `thel juxtaposed l thrustends of the fingers or'leversf23;` AInasmuch. as the ,thrust ring withjits thrust colla-r together with theV finger-holder Vnor- 1 mally rotate as ay unit, althoughshiftable Y axially relatively to each otherptheir juirf taposed* faces thus having a fixed relation toeach other, the fingers 23 at alltimes will .t

Contact at predetermined points voni the l l thrust Collar 22, andhencefit is merely nece essary tol provide hardened parts for en- 4 gagement with the bearing ends of thefin-i Y gers.' The thrust'icollar Vis also drilled through the center as at 27, and countersunk as at 28 toa suitable depth andl diameter.

rlhe push tubeV 4 at its rearjend 7 rests againstpa shoulder formed in the thrust coll lar a2. A f 4 l Y,

It will f beseen with reference, to Figs.- l

and 2 that the slots 10 are formedwith ay base adapted toactqasastop for Varrest-f Y lng the 'move-ment of the fingers 23 rela- Y tively to thek spindle illustrated are V'prevented byV virtue '.Q this Y Thus theY fingers as f lill' incassa limiting or stop means 29 from striking the spindle, vand niarring the same, which as hereinbefore stated, Vwould 'result in` hampering or interfering with .the Vfree sliding movement of the sliding wedge 3 over the spindle.

ln the operation of my improved chucking mechanism, it will be observed that as thewedge or sleeve 3 is forced by anysuit` or pull ends 25 engage the Vhardened .thrust receivingv parts26 of the Vthrust collar 22,

- such hooked thrust ends or pull ends travelend of :thespindle *fore will be forced in the direction of the dos ing duringthis operation toward the front The thrust collar therefront endof .the spindle and the pull tube being `Vin contact therewith, will be Aforced to travelin thesalne Ydirection conjunctively therewith. The-front end of the pull tube 4 being-Lin contact at 5 with the chueking jaws 6, will force the same Vforward during this operation and cause the Ajaws to close and clam-p or grip the Work. The thrust collar 22 being in engagement with the thrustring 18 as at '21,' the thrust ring will travel forwardly .inVV conjunction with the thrust collar ,as illustrated in Figs. 1 and 4, causing-the springs l1 to be compressed or placed under tension. i

ln the operation ol' unchuckingor freeing the work, the-wedge 3 will be 'forced to travel in the opposite direction away from theclinger holder 8. The springsl being under compressionat thistime, 'will force the thrust ring 18rearwardly carrying-with it Vthe .thrust collar 22,"and as a result the shoulders or thrust receiving parts 26 of the thrust collar will act to pull the hooked or Vpull ends 25 of the fingers rearwardly thereby forcing the front.A ends of the'ingers to travel down the inclined or conical laces 30 of the sliding wedge in the direction of the spindle-j It will be seen that the Vsprings 13 exert a positive andcontinucus action upon. the thrust ring 18 Sand as a result, asV the iingers are shifted inwardly .toward the spin`` die, `the thrust collar 22 is `held firmly against the thrust ends 25 of the lingers,

thusholding the ngersin place at all times and i ireventinofthe centrifural forcent the l. L b

revolving -spindleromithrowing the lingersv away Vfi'rom the spindle and causing the it willbe understood olV course,fthat as-V f the thrust collar and thrust ringmove 'away from the linger holder by virtue of the action of the springs 13, the lingers atthe same time traveling over the inclined faces of the sliding` wedge toward the spindle, the push tube 4 and the chucking -iaws 6 will simultaneously-.travel rearwardly thereby causing the'jawsto release their grip upon the work. lt will also be understood that the size of the springs 13 may be varied according to the speed of revolution of the spindle, the greater the speed ot revolution the larger the springs used. Hence irrespective of 4the rate of speedoi' the spindle, the direct and' positive action of the springs will overcome the centrifugal force tending to throw the fingers outwardly.

it will be seenithat by having the linger holder 8 threaded tothe rear end of the spindle, means-are thereby provided lor'adjusting the grip of the chucking aws on the work. `By shifting the nger holder rearwardly or in a direction away from the wedge, the thrust collar 22 will be forced in the saine direction, resulting in lessening the grip of the chucking jaws upon the work. if Vit is desired to tighten the grip of' the chuck upon the work, the linger holder will be shifted forwardly upon the spindle 1. V f Y Thus, it will be seen that by mounting the spring 13 interioriy of .the linger Vholder the danger of the' springs flying oil and becoming displaced is entirely eliminated, and furthermore by mounting the operating tingers` or llevers 23interiorly ol the finger holder, greater durability and effectiveness will 'be given to these parts in operation.

Although l have described my invention in its preferred form,it is` to be understood that l do not limit myseliL to the construction herein shown and described, except insofar as defined in the claims and embraced within the scope thereof.

l claim as my invention:

`1. Chucking mechanism comprising in combination a chuck, a 4thrust member and a finger holding member, fingers operative for moving one vrelatively to the other in one direction, and means for interconnecting said members, said means lcomprising a spring carried interiorly of one thereof, and

operative'to cause relative movement 'of saidmembers in the opposite` direction.

2. vChucking`- mechanism ot the class described comprising aychuck, a thrust member y and a finger holding-member shiftable relatively to' eachother in one direction for operating said chucln and resilient means for interconnecting said members and having a part carried interiorly of each thereof and effective to cause shitable movement of said chuck, a thrust member, nger holding titi member, and fingers operative to shift one member relatively to the other, resilient means for interconnecting said members and comprising a spring, and a pin engaging the spring, one thereof held interiorly of each member, said resilient means being operative to resist said relative movement of the members.

Il. Chucking mechanism comprising in combination, a chuck, an operating tubetherefor, a thrust member enga-ging the same, a finger holding member, resilientV V vmeans connecting said members together and `located interiorly thereof, a finger -pivoted to said holding member and engaging the thrust member, and a sliding Wedgev adapted to engage said finger for shifting said thrustV member and holding member-one relatively to the other, said members having their juxtaposed faces in fixed rotative relationtoeach other.

5. Chucking mechanism comprising in combination a4 chuck, an .operating tube therefor,- a thrust member engaging the same, afingerA holding member, resilient Y means connecting said members together and located interiorly! thereof, a. finger lpivoted to said finger holding member interiorly Y thereof and engaging said thrust member,

and a sliding `Wedge adapted to engage said fingerLfor shifting saidthrust member and holding member one relatively to tlie'other, Y

the holder for forcing saidnger againsttion. Y n

the. stop.

7. Chuck operating mechanism ofthe classv described comprising in combination a chuck,'a spindle, a nger holder mounted `on said spindle, thrust means cooperating with the holder, fingers pivoted to the holder and coacting with the thrust means, a springtcarried by'said holder interiorly thereof and Vconnected to said Vthrust means, and stop means carried by the holder for limiting the i .holder, Vfingers movement of the fingers toward the spindle.

8'. Ghucking mechanism comprising in:

combination a chuck, an operating member `A connected to said chuck, a spindle, a finger holder adjustably carried bysaid spindle,

thrustmeans comprising Vafthrust ring, a, thrust collarengaging said operating member, a. pair offingers pivoted to said holderyinterior-ly thereof `and having each a hookshaped thrust part engaging said thrust collar, a sliding Wedge adapted to engage said'fngers for shifting saidt-hr-ust collar 4and thrust ring relatively' to said fingerholdingmember thereby -toshift said oper-A i holder, fingers carried 'Y thereby, means having a; part; coactin'g Vwith the ating member for operating the chuck, and

resilient means connecting said finger hold- Y er and thrust ring-together and comprising a-spring anda pin, one thereof held'inte-V riorly-of each. Y Y Y p. i ,A Y

9. Chucking mechanism v comprising in combination a chuck, an operating member connected to saidchuck, aV spindle, a :finger holder adjustably carried byk 'said spindle, thrust means comprisingy a thrust ring, a thrust collar engaging said operating member, a pair-of fingers pivoted to said holder` interiorly thereof and having'eaoha hookshaped thrustpart engaging said thrust collar, -a sliding :Wedge adapted ,tol'engage said fingers for shifting said thrust-collar and thrust riiiglrelatively tosaid `finger holding member Vthereby .to shift said operating member v'for-operating the chuck, and resilient meansconnecting said finger holderand thrust ring together and comprising a.VV spring and a pin, one thereof held interiorly of each, ysaid .finger holder having stopVV means for vlimiting the movement ofthe fingers relatively to the spindle.` .i

l0.v The combination :of Va -chuckf'operat- .ing means therefor, a finger holdeiga thrust, plate, fingers pivoted to's'aid holder, meansconnecting said-plate and operating means. togethenand resilient means connecting said holder and plate together, thefingers operative to shift the thrustplate in onemiA direction againstthe'action of saifdresilient means.

ll. The combination ofa chuck,a finger holder, fingers-carried thereby, a Vpair of connected thrust members, one Ythereof coacting With-the fingers and,one-'thereofV re-l silieiitly connected tothe holder, said fin-V gers operative to shift the thrust members against the action 12. vThe combination of a chuck,V a finger holder, lfingers 'carried therebggfthrustV means havingV af partjcoacting .With the fingers anda part resiliently. connected VVto of the.A resilient -connec the holder, said fingers operative to cause relatively shiftable; movement ofthe thrust means and the holder. aga-inst Vtheaction ,ofy

said-resilient connection@ Y, p

13. The combination of Va chuck, a nger carried thereby, .Y- thrust means having aV part enacting VVWiththe fingers and a part `resiliently. connected to the holder, said fingersv operative to cause relatively shiftable movement-of the thrust means and theholderagainstfthe action of said resilient connection, said holder and thrust means being rotatable` together.

14. The-combination ofa chuck, a linger thrust fingers and a. partresilientlyseonnecte'd'to the holder, saidifiiigers Voperative tocause :relatively shiftable movement vof thezthrust Y means and the'holder against the action ei? the resilient connection, and a linger stop Vcarried by said holder.

l5. The combination of a chuck, oper- 5 ating means therefor, a. ringer holder and a member shiftable one relatively to the otherand rotatable together, fingers carried by the holder, a resilient connection between the holder and member, said member and holder having one a Connection with said 10 operating means, and said lingers being operative to cause relative shift-able movew ment of the holder and member against the action of said resilient connection.

Signed at Cleveland, Cuyahoga County, 15 Chio, this 29th day or' April, `1921.

ALFRED E. DRISSNER. 

